Glomus body

A glomus body (or glomus organ) is a component of the dermis layer of the skin, involved in body temperature regulation.[1][2] The glomus body is a small arteriovenous anastomosis surrounded by a capsule of connective tissue. Glomus bodies (glomera) are most numerous in the fingers and toes. The role of the glomus body is to shunt blood away (heat transfer) from the skin surface when exposed to cold temperature, thus preventing heat loss, and allowing maximum blood flow to the skin in warm weather to allow heat to dissipate.[1] The glomus body has high sympathetic tone and potentiation leads to near complete vasoconstriction.

The glomus body is not to be confused with the glomus cell which is a kind of chemoreceptor found in the carotid bodies and aortic bodies.

Endothelial cells form a single, continuous layer that lines all vascular segments. Junctional complexes keep the endothelial cells together in arteries but are less numerous in veins. The organization of the endothelial cell layer in capillaries can varies greatly, depending on the location. The arteriovenous shunt of the glomus body is a normal anatomic shunt as opposed to an abnormal arteriovenous fistula. A metarteriole is another type.